Malicious PDF — malware analysis report

Static analysis result for SHA-256 1057f74828f08e43…

MALICIOUS

PDF

7.8 KB Created: 2012-04-27 17:25:24
MD5: 8f96f8dcd4dafb36f80a72047ff0afb1 SHA-1: 5b588fb5e1fcedb3a22ca3b6c7139aa00c1eb8c2 SHA-256: 1057f74828f08e433abee10185a16477dfc1eade31767cb555a625681ff97c5f
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including an ML classifier and ClamAV detection for an exploit. It contains an embedded file and an embedded script payload, indicating it is designed to exploit vulnerabilities and download further malicious content. The embedded file, 'embedded_file_obj0010.bin', is the primary indicator of the dropped payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-156969-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-156969-1
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0010.bin
b2974196efd6ffc3f2edd0bfd3ea805f90465257b3bb0de6e18b84a6fa290e0a		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0xCB8 7229 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).

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